This reference page is linked to from the following overview topics: Color Palettes.

Detailed Description

See also:: Advanced Topics on Palettes, Class Color, Class GammaMgr, COLORREF.

Description:: A useful utility class for managing user interface colors. This class has several purposes:

Maintain the default 3ds Max palette for doing 256 color graphics.

Provides a mechanism for allocating "animated color slots" in the default palette for use in the user interface.

Provide various functions for doing dithered graphics using the default 3ds Max palette.

All methods of this class are implemented by the system.

The following global function is used to get a pointer that may be used to call the methods of this class:

#include <gport.h>

Inheritance diagram for GPort:

Public Member Functions
virtual	~GPort ()
virtual int	AnimPalIndex (int i)=0
virtual int	GetAnimPalSlot ()=0
virtual void	ReleaseAnimPalSlot (int i)=0
virtual void	SetAnimPalEntry (int i, COLORREF cr)=0
virtual HPALETTE	PlugPalette (HDC hdc)=0
virtual HBRUSH	MakeAnimBrush (int slotNum, COLORREF col)=0
virtual int	UpdateColors (HDC hdc)=0
virtual void	AnimPalette (HDC hdc)=0
virtual void	RestorePalette (HDC hDC, HPALETTE hOldPal)=0
virtual void	MapPixels (UBYTE inp, UBYTE outp, int x, int y, int width)=0
virtual void	DisplayMap (HDC hdc, Rect &drect, int xsrc, int ysrc, UBYTE *map, int bytesPerRow)=0
virtual void	DisplayMap (HDC hdc, Rect &dest, Rect &src, UBYTE *map, int bytesPerRow)=0
virtual void	DitherColorSwatch (HDC hdc, Rect &r, Color c)=0
virtual void	PaintAnimPalSwatch (HDC hdc, DWORD col, int slot, int left, int top, int right, int bottom)=0
virtual HPALETTE	GetPalette ()=0

Constructor & Destructor Documentation

virtual ~GPort ( ) [inline, virtual]

Remarks:: Destructor

{;}

Member Function Documentation

virtual int AnimPalIndex ( int i ) [pure virtual]

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Remarks:: Retrieves the palette index associated with the 'i-th' slot.

Parameters:: int i

Specifies the slot.

virtual int GetAnimPalSlot ( ) [pure virtual]

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Remarks:: Returns a slot number if available, -1 if not. Typically this is called in WM_INITDIALOG processing code for as many slots as you need (the total number available is 8).

Returns:: A slot number if available; otherwise -1.

virtual void ReleaseAnimPalSlot ( int i ) [pure virtual]

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Remarks:: Releases the specified animated palette slot. Typically this is called in the WM_DESTROY code for each slot obtained with GetAnimPalSlot().

Parameters:: int i

The palette slot to release.

virtual void SetAnimPalEntry	(	int	i,
		COLORREF	cr
	)		`[pure virtual]`

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Remarks:: Sets the color associated with the 'i-th' animated slot.

Parameters:: int i

The slot index.

COLORREF cr

The color to set.

virtual HPALETTE PlugPalette ( HDC hdc ) [pure virtual]

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Remarks:: This method puts the standard 3ds Max palette into the palette for the HDC, handing back a handle to the old palette.

Parameters:: HDC hdc

The device context.

Returns:: The handle of the old palette.

virtual HBRUSH MakeAnimBrush	(	int	slotNum,
		COLORREF	col
	)		`[pure virtual]`

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Remarks:: This method creates a brush for drawing with the specified animated palette slot color.

Parameters:: int slotNum

The animated palette slot.

COLORREF col

The color to use.

Returns:: The handle of the brush created.

virtual int UpdateColors ( HDC hdc ) [pure virtual]

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Remarks:: This method calls the Windows API UpdateColors() on the specified device context handle hdc. Call this when you get a WM_PALETTECHANGED message.

Parameters:: HDC hdc

The handle of the device context.

Returns:: Nonzero if it changed screen pixel values; otherwise zero.

virtual void AnimPalette ( HDC hdc ) [pure virtual]

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Remarks:: After several calls to SetAnimPalEntry(), call this to affect the HDC's palette. This puts the palette into the HDC so it will take effect.

Parameters:: HDC hdc

The handle of the device context.

virtual void RestorePalette	(	HDC	hDC,
		HPALETTE	hOldPal
	)		`[pure virtual]`

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Remarks:: This method puts the previous 3ds Max palette (returned from PlugPalette()) into the palette for the HDC.

Parameters:: HDC hDC

The handle of the device context.

HPALETTE hOldPal

The palette to restore.

virtual void MapPixels	(	UBYTE *	inp,
		UBYTE *	outp,
		int	x,
		int	y,
		int	width
	)		`[pure virtual]`

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Remarks:: This method maps a single row of pixels in 24 bit color to indices into the current GPort palette, applying a dither pattern. This routine does NOT do gamma correction.

Note that x and y are necessary to establish the dither pattern alignment. The dither pattern covers the entire map, and if you want to just dither part of it, you need to tell this method where you are within the pattern.

Parameters:: UBYTE* inp

Points to an array of width BGR triples. This is a sequence of bytes structured as B,G,R,B,G R, etc. The first pixel is B,G,R then the next pixel is B,G,R, etc.

UBYTE *outp

The result - the color indices into the GPort palette. This array is width bytes in length.

int x

The x alignment position.

int y

The y alignment position.

int width

The number of items in the arrays above.

virtual void DisplayMap	(	HDC	hdc,
		Rect &	drect,
		int	xsrc,
		int	ysrc,
		UBYTE *	map,
		int	bytesPerRow
	)		`[pure virtual]`

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Remarks:: Display an array of 24 bit colors in the HDC. If the current display is 8 bit it will display it (with dither) using in the GPort palette, otherwise it will just blit to the screen. This method does NOT do gamma correction.

Parameters:: HDC hdc

The handle of the device context.

Rect& drect

The destination rectangle in the hdc.

int xsrc

The X position within this source raster of the upper left corner of the rectangle to be copied.

int ysrc

The Y position within this source raster of the upper left corner of the rectangle to be copied.

UBYTE *map

Points to an array of BGR triples.

int bytesPerRow

The number of bytes per row on each scanline of map.

virtual void DisplayMap	(	HDC	hdc,
		Rect &	dest,
		Rect &	src,
		UBYTE *	map,
		int	bytesPerRow
	)		`[pure virtual]`

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Remarks:: This version of DisplayMap() stretches the image if the source rectangle is not the same size as the destination rectangle. src should be the size of the image.

Parameters:: HDC hdc

The handle of the device context.

Rect& dest

The destination rectangle in the hdc.

Rect& src

The source rectangle in map.

UBYTE *map

Points to an array of RGB triples.

int bytesPerRow

The number of bytes per row on each scanline of map.

virtual void DitherColorSwatch	(	HDC	hdc,
		Rect &	r,
		Color	c
	)		`[pure virtual]`

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Remarks:: This method first gamma corrects Color c using the current display gamma. In paletted modes, it will fill rectangle r with a dithered pattern approximating Color c. In 24 bit modes it just fills the rectangle with Color c.

Parameters:: HDC hdc

The handle of the device context.

Rect& r

The rectangle to fill.

Color c

The color to approximate (8 bit) or fill with (24 bit).

virtual void PaintAnimPalSwatch	(	HDC	hdc,
		DWORD	col,
		int	slot,
		int	left,
		int	top,
		int	right,
		int	bottom
	)		`[pure virtual]`

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Remarks:: This method attempts to use the animated color slot indicated by "slot" to paint a rectangular color swatch. If slot is -1, it will uses DitherColorSwatch(). This method does handle gamma correction.

Parameters:: HDC hdc

The handle of the device context.

DWORD col

The color to paint. The format is the same as COLORREF.

int slot

Specifies the slot to use. If -1 then DitherColorSwatch() is used.

int left

The left coordinate of the rectangular area to paint.

int top

The top coordinate of the rectangular area to paint.

int right

The right coordinate of the rectangular area to paint.

int bottom

The bottom coordinate of the rectangular area to paint.

virtual HPALETTE GetPalette ( ) [pure virtual]

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Remarks:: Returns the current GPort palette.

GPort Class Reference

Detailed Description

Public Member Functions

Constructor & Destructor Documentation

Member Function Documentation